Punching and shearing machine



(NoModeL) 2 Sheets-Sheet 2' G. J. SAURBREY. PUNOHING AND SHEARING MACHINE.

No. 458,363. Patented June 2,1891.

. WITNESSES:

Y Arron/15m UNITED STATES PATENT OFFICE.

GEORGE J. SAURBREY, OF COLUMBUS, OHIO.

PUNCHING AND SHEARING MACHINE.

SPECIFICATION forming part of Letters Patent No. 453,363, dated June 2, 1891. Application filed September Il, 1890- S erial No. 364,698. (No model.)

To all whom, it may concern.-

Be it known that I, GEORGE J. SAURBREY, a citizen of the United States, residing at Co-' lumbus, in the county of Franklin and State of Ohio, have invented a certain new and useful Improvement in Punching Presses and ghears, of which the following is a specifica- 10D. My invention relates to hand-power punching-presses; and the objects of my invention are to provide an improved form of punching and shearing press which maybe operated by hand through the rotation of a fly-wheel; to provide improved mechanism for engaging the fiy-wheel and operating-shaft and disconnecting the same at each revolution of the fiy-wheel; to insure the disengagement of the shaft and fiy-wheel when the cross-head is at its highest point in its bearings; to provide such construction as will admit of the machine being thrown into gear by hand or foot power; to provide an improved work-holding device and superior means for operating the same; to construct said punching-machine in a substantial and neat form, and to produce other improvements, which will be more fully hereinafter set forth. These objects I accomplish 1n the manner illustrated in the accompanying drawings, in which Figure 1 is a side elevation of my improved punching-press, showing the position of the parts when the same is running. Fig. 2 is a similar View of the opposite side of the press from that shown in Fig. 1, showing the position of the clutch and other parts when the machine is at rest. vFig. 3 is a plan view of the head or upper portion of the machine, omitting for the sake of clearness some of the parts which appearbelow the head. Fig. 4: is a sectional View of the cross-head, showing the outer half of the cross-head boxing removed. Fig. 5 is a detail view in perspective of the upper portion of the lever which operates the work-holding device and showing the means of locking said lever at the desired angle. Fig. 6 is a central vertical longitudinal section of the machine. Fig. :7 is a rear view of the same. Fig. 8 is a plan view in detail of the die-bed and work-holding arm. Fig. 9 is a transverse section of the operating-shaft, taken between the sliding clutch and the frame.

Similar letters refer to similar partsthroughout the several views.

(4 represents the upright frame or body of my machine, which has formed on its upper side a horizontal cylindrical shaft-bearing box a. The forward side of the frame a is provided, as shown, in its upper half with a transverse recess or mouth, above which is thus produced a short forwardly-extending jaw a and below which is provided a die-block seat or lower jaw cu.

J ournaled within the frame-boxing a. is the forward portion of ahorizontal shaft 7). Upon the rear extremity of this shaft is loosely mounted a fly-wheel b, said fly-wheel having formed in its hub a forwardly projecting clutch-head b which is provided on opposite sides with clutch-notches b Loosely mounted-011 theshaft b isasliding clutch b, the latter being supported between the clutch-head b and the rear end'of the boxing a, and being prevented from turning on the shaft by a horizontal key 19 This sliding clutch has projecting rearwardly therefromoppositely-located tongues b, which are of such form as to enter and fit loosely within the clutch-head notches 12 As shown in the drawings, the sliding clutch has sufficient play on the shaft to admit of itbeing drawn backward such distance as to completely disconnect its tongues b from the clutch-head.

Formed in the clutch Z2 and encircling the same are two peripheral grooves or guideways jecting from the upper side of the shaft or frame-head a are two parallel clutch-holding arms (1 (1. These arms are pivoted or journaled, as shown, on a transverse pin (1 the arm d being supported thereon at about the center of its length, and havingits rearwardly-extending end portion provided with a vertical pin 1), which carries on its lower end, beneath said arm d, a small frictionroller, being adapted to bear, as hereinafter more fully explained, againstthe forward rim of the sliding clutch. A set-screw d passes through the arm (I in rear of its pivot-point and bears on the boxing a. The forward end of the arm d is normally pressed downward by a spring-strip (1 which bears, as shown, beneath the rear projecting end of said arm and the upper side of the frame-head a. The arm (1 extends beyond the termination of the arm (I, and is provided, as described for said arm (I, with a downwardly-projecting frictionroller 6, which may be made to extend within the clutch-groove c. This arm d is also provided with a set-screw e, which passes vertically'therethrough and comes in contact with the frame-head. The forwardly-projecting end of the operating-shaft b has extending therefrom out of center ashort eccentric-pin f. Suitably journaled on this eccentric-pin is the upper end of a downwardly-extending drive-arm f. This drive-arm loosely enters an approximately-V-shaped socket or recess formed in a vertical cross -liead f within which the lower end of said drive-armis pivotally held bya transverse pin f. The body of the cross-head is movably supported in a vertical bearing-box, one half of which is formed in the forward side of the frame-jaw (t and the outer half of which is formed by a half-boxing plate f, the projecting flanges of which are bolted to corresponding flanges on said frame-jaw. The lower end of the cross-head is provided with a suitable tooltion, thus providing the cross-head with angular bearing-surfaces.

The lower jaw or die-bed a is provided with a suitable die-holding plate g, said plate having a central seat or depression for the reception of a die-block g.

Projecting rearwardly from the upper por tion of the frame a is a lug or shoulder a One end of the lug a" is pivoted to the lower and forward end of a bell-crank lever 9 This lever g has formed therewith at its angle or junction of its arms atransverse rod 9, which,extending beneath the clutch, is journaled in the opposite end of the lug a" and has its extremity connected or formed with the angle of a bell-crank 72 as prescribed for the bell-crank 9 Each of the bell-cranks have their upper arms terminating at a point opposite the center of the height of the shaft 1) and supports at its upper end and inner side a small idler or friction-block h, which bears against the periphery of the sliding clutch and within the groove 0.

, Each of the bell-cranks g It has depending from the junction of its arms and formed therewith a downwardly-extending linger 9 Against the forward side of these fingers press the upper ends of spring-strips which extend downwardly and forwardly and have their lower portions bolted or otherwise secured to the rear side of the main frame a. The lower arm of the bell-crank his longer than the corresponding arm of the bell-crank g and has pivotally connected with its outer end portion the upper end of a rearwardlyextending pitman-rod ii. The lower end of this pitman is pivotally connected with the rear end of a treadlearm j. This treadlearm is pivoted at about the centergof its length to a lug j, which projects upwardly from the frame-base near the forward side thereof, and has on its forwardly-projecting end a suitablefoot-plate 9' j" represents a lever, which is pivoted at a point in its rear half'to the outer side of the frame-head, and which is jointedly connected in rear of its pivot-point with the forward end of the lower arm of the bell-crank h bya link or short rod j".

Formed through the frame a of the machine and leading to the punching-mouth thereof is a mortise 7a, through which passes loosely, as shown, a work-holding arm 75, the latter extending within the frame-mouth to a point slightly past and beneath the center of the cross head and being pivoted, as shown, to said frame or a lug projecting therefrom, as shown at 73. The rear and projecting portion of the arm It bears upon the upper side of a cam or eccentric wheel k which is supported on a short transverse shaft, the ends of which are journaled in suitable boxings supported from the rear side of the frame. The rear extremity of the arm k is connected with a lower outwardly-projecting frame-arm m by a vertical coiled spring m the tension of which serves to hold the rear portion of the work-holding arm in contact with the cocentric k That portion of the work-holding arm immediately beneath the cross-head is, as shown in detail in Fig. 8 of the drawings, bifurcated or slotted at the center of its width to allow the tool n to pass therethrough into the die-block g.

The eccentric is operated by hand-lever n, which has its rear and lower end rigidly connected with the shaft m and extending upwardly and forwardly passes between the two curved and parallel arms of the stopbracket 0. The two curved arms which form said stop-brackets have their ends secured to and supported from the side of the main frame, the inner arm 0 thereof having formed on its inner side at regular intervals teeth 0 as shown in detail in Fig. 5 of the drawings. The upper portion of the lever-handle 12' above said bracket has hinged thereto the upper portion of an ordinary spring-actuated lever-pawl 0 the lower end of which is normally supported between two of the teeth 0 q represents a horizontal U-shaped gagered, the ends of which pass through and are adj ustably held within the vertical side flanges a of the frame-mouth by means of two setscrews a The forward portion of this gage rod or bar extends in over the die-bed or lower jaw of the frame and is adapted to be brought into contact with the rear edge of the material to be punched.

8 represents a treadle latch-bar, which, being pivoted at about the center of its length to the forward side of the frame a at a point above the treadle-bar. is of such length as to admit of its lower outwardly-curved end be ing forced over the upper side of the treadlebar near the foot-plate thereof and serves to hold the latter down by contact with the treadle-bar. As is usual in this class of machines, this downward movement of the crosshead drives the tool 11 into or through the work to be punched, which rests upon the dieblock.

In case it is desired to run the machine continuously-i. 6., without throwing the machine out of gear at each stroke-the clutch-holding arm cl is so elevated by turning its set-screw e as to withdraw the roller or pin 6 from the guideway c, as shown in Fig. l of the drawings. In this case the machine is retained in gear by either keeping the treadle foot-plate under pressure of the foot or by,so turning the latch-bar s as to cause it to hold said foot-plate down in position shown in Fig 1, and the roller (1 of the arm (1 is allowed to run against the forward end of the sliding clutch. v

In case it is desired to throw the clutch out of gear after each stroke of the punch in order to gain time to adjust the work on the die-block, the foot-treadle may be released from the pressure of the foot after each stroke and the sliding clutch allowed through pressure of the springs g to disengage itself from the clutch-head, when the friction roller 61 of the arm 01 passes into the notch 19 of the clutch 11 This method of operating the punch, however, requires a prompt-releasing of the treadle at the proper moment to prevent the notch of the clutch-rim passingthe friction- .roller, and thus producing a second stroke of the punch before the machine is thrown out of gear.

In order to insure the automatic disengagement of the clutch at each rev0lntion,I have provided the irregular guideway c with a clutch-holding arm d,which, when the arm at has been screwed up until its roller (1 is disengaged from the clutch, may by the turning of its set-screw'be allowed to assume the position shown in Fig. 2 of the drawingst'. (5., with its pin or roller e hearing within the guideway 0. At the completion of each stroke of the cross-head the cam 0 formed by the irregularity of the groove 0-, will, by contact with the pin e, have thrown the clutch out of "car.

a The location of the notch 19 of the frictionroller is such as to bring it opposite the friction-roller d at the moment the cross-head is at its highest point, thus leaving the crosshcad in position for a full stroke when this friction-roller is in use.

It is obvious that the operation of the clutch may be accomplished by hand as well as by foot power by raising and lowering the lever fiwhich, through its connection with the bellcrank h, as heretofore described, will result in the throwing of the sliding clutch backward and forward.

The work to be punched having been placed on the die-block in the desired position, it may be firmly held in place by forcing clownward the lever it until the cam 15, through the pressure thus caused on the lever-arm It, will have firmly pressed the forward bifurcated end of said lever-arm against the work. This work-holding device will not only serve to secure the work in position, but will prevent the latter from being carried upward at the upstroke of the tool.

It is obvious that the herein-described machine may be run by power, if desired, and that a shearing or other tool may be substituted for the punching-tool shown.

Having now fully described my invention, what I claim, and desire to secure by Letters Patent, is

1. In a punching-machine, the combination, with the main frame, an operating-shaft mounted in said frame, an eccentric-pin on said shaft, a cross-head boxing approximately square in cross-section, one-half of said boxing being detachable, as described, a reciprocating cross-head mounted in said boxing, and a drive-arm connecting said cross-head and shaft eccentric-pin, of a fly-wheel mounted loosely on said shaft and having a clutchhead in its hub, and a sliding clutch keyed on said shaft and adapted to be made to interlock with said clutch-head, substantially as specified.

2. In a punching-machine, the combination, with themain frame, a driving-shaft 1), running therein, a fly-wheel b, loosely mounted on said shaft and having a clutch-head 11 a sliding clutch keyed on said shaft, a pcripheral guideway c, and an end notch b in said sliding clutch, of clutch-holding arm d supported from the main frame and adapted to alternately press against the sliding clutch and enter the notch 11 as the operating-shaft is rotated, substantially as described.

3. The combination, with the frame a, a driving-shaft I), mounted therein, a hand fiywheel I), having a hub clutch-head b and looselymounted on shaft 1), a spring-actuated sliding clutch keyed on said shaft and adapted to interlock with said clutch-head, a peripheral guideway c, encircling said sliding clutch and curved to form thereon a peripheral cam 0 of an adjustable clutch-holding armcl', journaled upon the frame-head at one end and having its opposite end entering the guideway c, and means for imparting a sliding motion to said slidingclntch upon said shaft, substantially as described.

i. The combination, with the frame a, having jaws a a3, and a die-holding plate g, of a work-holding arm 79, pivoted to said frame and having its forward bifurcated end projecting over said die-block plate, a spring-pressure on the opposite end of said work-holding arm, and a cam-wheel upon which the rear portion of said work-holding arm bears, said camwheel adapted to be turned to exert an upward pressure on the rear portion of said IO Work-holding arm through asuitabie lever 71', substantially as described.

GEORGE J. SAURBREY. In presence of- O. O. SHEPHERD, THOS. S. GATES. 

